MY DC POWER SUPPLY

TAKEN A ATX SMPS AND CONVERTED IT AS MULTIPLE POWER SUPPLY AS 3.3 VOLT, 5 VOLT AND 12 VOLT. YELLOW WIRE 12VOLT, RED WIRE 5VOLT & ORANGE 3.3VOLT. ALL BLACK WIRES ARE GROUND. THAT'S ALL FOLKS. IT HELPS TO LED BY 3.3VOLT. 5VOLT FOR MOBILE CHARGING, EVEN TO RECHARGE RECHARGEABLE BATTERIES IN PARALLEL CONNECTIONS. 12 VOLT FOR TESTING MOTORS AND SO ON. OPTIONS CHANGES AS THE BRAIN WORKS CUS MACHINE HAS NO BRAIN... USE YOUR'S!!!!!!!!

rimar, are you looking for the schematic of a switching supply? Seen plenty on the net The following link (careful, it may be LONG!) will call-up images on Google.. (I noticed quite a few regulated linear supply schematics intermixed). Or, are you asking about how to convert a supply? Again, plenty of source material here on instructables.

One side note, depends on how old the supply is, but quite a few of the 5/-5/12/-12 & later 3.3 supplies, under 200W, needed some kind of load on the 5V (NOT 5Vsb!!!) to maintain the switching circuitry, otherwise the supply would shut-down. I've seen quite a few versions here on instructables which used a 10-ohm, 10-Watt sandblock resistor across a single 5V & GND pair, but I imagine that resistor would get wicked hot! Two supplies I've converted for electronics projects, I use a 33-Ohm, 5W. A 400W supply I converted, already had a metal-film version hard-soldered to the board between wire sets, the 200-watt Dell supply I converted, needed the load resistor. As anyone else should know, Note the 'Working Voltage" of the capacitors on the mains side. Read the W.V. value, and be warned! Even though you're working with 115 to 240V, these are little defibrillators just waiting to knock you on your keester! Think of how bright a xenon flash tube blinks, and imagine a short across the pins of those capacitors with the same brilliance.

I think rimar2000 means you have to connect the green power control wire to the black wires to turn on some PC power supplies. Also you should have a 10 ohm 10w resister across the +5v s to stabilize the supply. Check out the many other similar Instructables if you need more info.

depends on the maker.. I just ran across one, where the Pwr-On wire was grey, and didn't need any load to run.

Also, I prefer supplies that have a separate Mains switch. Otherwise, the supply is actually active even if the Pwr-On wire isn't connected to GND. Remember, it needs to power the +5Vsb (which would be on constant), which is used with the momentary contact power switch for the computer (also was used with motherboards that had Pwr-On options for LAN & modems).